Mold for storage-battery grids



L. B. HILLS. MOLD FOR STORAGE BATTERY (saws.

APPLICATION FILED NOV- 20."l9\6- Patented Aug. 16,1921.

HOV W 2 L.

UNITED ST T S PATENT OFFICE.

won a. HILLS, or mnwoon. onro, assronon, BY mun assmmmrrs, ro

' NATIONAL cannon comm, me, a conronacrron or NEW YORK.

' IOLD FOB STORAGE-BATTERY GRIDS.

7 '0 all whom it mag concern:

Be it known that I, LEON B.Hn.r.s,a citi zen of the 'United States, andresident of Lakewood in the county of Cuyahoga and This inventionrelates to mo ds for storage battery grids or electrodes and one objectis to design a mold of such structure that the parts can be readilymachined to fit together without exercising more than ordinary care. I

Another object is to produce a mold that will cast a grid of minimumweight for given strength which will be free from fins and have anincreased tendency to retain the paste in lace.

A furt er'object is to provide a mold that will extend the side ribscloser to the center of the grid to increase the conductivity withoutadding to the weight and with increased transverse strength.

Referring to, the drawings:

Figure 1 is a plan view of the upper half of the mold shown in Fig. 2.

Fig. 2 is a section with the halves separated, the lower half only beingcompletely. machined, and the section of the upper half correspondingwith the line A-A of Fig. 1.

Fig. 3 is a section similar to Fig. 2, excepting that the mold iscompletely ma- --chined and the halves are in operative position.

Fig. 4 is a section of the molds in the lane of the line B-'-B of Fig.1, the halves eing shown in o erative position.

Flg. 5 is a si e-view of a grid cast in my improved mold. v

Fig. 6 is a section on the line C-C, of Fig. Referring to-Figs. 1 and 2,one-half ofa mold 1 is rabbetted at 2 to form the frame of the grid.This rabbet or groove may be put in the molds in well known ways andinasmuch as it is not novel 1 see I have not illustrated the make-up othe mold to indicate I Specification of Letters Patent. Application fledNovember 80, 1910.

Patented'Aug. 16, 1921.

i this can be done. When the groove 2,

howe ver,-has been formed I machine a plurality'of triangular oves 3transversely of the mold, forming rldges 4. Then grooves 5 are-machinedin the'bottom of the grooves3 as shown in Fig. 3, and cross grooves 6are cut to form the strengthening ribs of the grid.

The lower half of the mold is made similar to the upper halfexceptingthat the grooves 3" and 5 are staggered in respect to the grooves 3 and5 respectively.

' When thev two halves areplacedtogether moltenlead is poured into'thegate 7 to fill the grooves 2, 5, 5 and 6. After cooling the halves areseparated and the grid removed. The structure of the grid is clearlyshown in Figs. 5 and 6. The novel feature of the grid resides in theshape of the bottom portion 8 of the ribs 9, this shape being such thatthe boundary of the cross-section of any rib shows a reentrant angle.Heretofore the ribs have been made with a fiat base, and

my improvement not only reduces the amount of lead required withoutdecreasing the strength, but it also furnishes additional means forretaining the paste.

Also the prongs 9 pro eot-toward the center of the plate and providemeans for the current reachingia greater amount of the active materialby a path of good conductivity.

To a mechanic it would be a simple matter to machine the grooves 3 and 5on a planer and when the twolhalves are finished. they will fitperfectly and cause no fins to be formed on the grid.

Having described my invention what. I claim is A mold for battery gridscomprising separable halves adapted, when fitted together. to define aseries of communicating passages located in parallel planes, each ofsaid passages containing a rentrant angle in the boundary of itscross-section.

In testimony whereof I hereunto afiix my si 'ature.

gn L. B. HILLS.

